[Unknown Zone]

Magicall is a very powerfull and sometimes a very confussing program with many features, most of the time users have no need to get agressive with the program but yes you can block numbers based on area code, got this from the manual:

(This field is optional for filter type Contacts and Unknown Number. If it contains contents, the phone number being compared must match both criteria. If it is empty, the phone number being compared only needs to match the filter type criterion.)

Examples:
To block the entire area code 852, enter (852)* or (852)???-????.
To block any phone number containing 7, enter *7*.
To block all other phone numbers except 12345678, enter ~12345678.
If you want to block phone number 633-7777 but not care about its area codes or country codes, just enter 633-7777.

Each item consists of a phone number and an optional comment using one space as the separator, so please don't leave spaces among phone numbers. To separate multiple items, use ';'. For example: (123)456-7890 Jack Will; (987)654-3210 Peter Lee; 135-790-8642